Self-adjusting frost-protector for ventilating-pipes



T. C. BOYD. SELF ADJUSTING' FROST PROTEGTOR POR VBNTILATING PIPES.

Patented Ma.1.31,1891.

(No Model.)

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THOMAS C. BOYD, OF CHICAGO, ILLINOIS.

SELF-ADJUSTING FROST-PROTECTOR FOR VENTILATING-PIPES.

SPECIFICATION forming part of Letters Patent No. 449,199, dated March31, 1891.

Application filed January 20, 1891. Serial No. 378,459. (No model.)

To @ZZ whom 71mg/ concern:

Be it known that I, THOMAS C. BOYD, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Self-Adjusting Frost- Plotectors for Ventilating and other Pipes, ofwhich the following is a full, clear, and eX- act description, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which- Figure 1 is a central vertical sectional Viewof the upper or exposed portion of a ventilating-pipe to which isapplied my improved adjustable frostprotectoiz Figs. 2, 3, 4, 5, and 6are like Views showing modifications thereof; and Fig. 7 is a plan view,in detail, of the coniiecting-iiange and clam ping device.

Corresponding letters of reference in the different figures indicatelike parts.

The object of my invention is t-o so cons truct a frost-protector forthe exposed portion of ventilating-pipes-sueh as soil-pipes, ventilatorsfor sewers, traps, and other analogous purposes, and steam-pipes whichmay be so constructed as to protect said pipes from the accumulation ofice and frost by means of an air-tight jacket surrounding the exposedportion of thcpipe, while at the same time the device may be adapted toyield longitudinally, so as to provide for expansion and contraction inthe pipes, the settling of the building or roof, or variations resultingfrom kindred causes. k

To these ends my invention consists in the combination of elementshereinafter more particularly described and claimed.

Referring` to the drawings, n, represents the roof a building, throughwhich is projected the usual Ventilating or steam pipe Z). Surroundingthe upper end of the pipe and projecting downwardly either to or belowthe root", as may be preferred, is an air tight cylindrical jacket c ofa diameter enough greater than that of the pipe to enable an air-space dto be formed between the two. The cylindrical jacket c is perfectly openat the bottom, as shown in Figs. 1, 2, 4, 5, and G, so as to receive acirculation of warm air from the building, or the bottom may be closed,as Shown in Fig. 3, thereby forming a dead-air space around the pipe tobe protected. The

first con struction, in a general way, is shown in my Patent No.334,337, dated January 12,1886, while the latter is shown in LettersPatent No. 346,714, granted to me August 3, 1886; butin neither of theconstructionsdescribed in said patents is there provision made for theexpansion and contraction of the pipe under variation of temperature orfor the settling of the building or roof, which may strain or ruptureeither the pipe-joints or the joint connecting with the building. Inorder to provide for the movement, I have so constructed the jacket asto permit it to yield longitudinally, either by telescoping upon thepipe which it surrounds or upon itself, one or the other of whichmethods may be employed in various modified forms without departing fromthe essential features of my invention.

In Fig. 1 I have shown the upper end of the pipe Z) as having areturn-flange c., cast or otherwise formed thereon, secured to which isa secondary flange e, preferably of sheet metal. A space is left betweenthe two iianges e e for the reception of a sheet-metal cylinder f, whichis intended to fit so closely between the flanges as to form anair-tight joint, or substantially so, while said cylinder' and flangesare free to move upon each other like the sections of a telescope. Itwill thus be apparent that if the lower end of the cylinderf is leftopen at the bottom, as shown, a constant circulation of warm air fromthe building may be maintained around the eX- posed end of theventilating-pipe, while an expansion or contraction of the pipe mayoccur, or the roof may settle without injury to the pipe or anything inconnection therewith.

In Fig. 2 the flange eis reversed, projecting upwardly around the top ofthe pipe b into the space between which a depending or return flange fis loosely inserted, the space between the pipes h and f/ being filledwith tar or mercury to prevent water from leaking into the building andat the same time pro vide a yielding joint.

In Fig. a sleeve 71, is formed upon the upper end of the cylinder j tofit the pipe b, while the annular fla-nge c is arranged to fit over thesame, said flange being attached to the upper end of the pipe b,preferably by means of a band L', secured by a bolt i', passed throu ghlugs at the meeting ends of said band.

Fig. 5 shows a modification of theconstruction last described, in whichthe tclcscopiug is accomplished substal'ltia'lly as in Fi l.

Fig. 4 is a modification of' Fig. l, in which a rim is cast upon theupper end of the pipe, and the depending flanges which meet thecylinderfarc both formed from sheet metal. A l'oof-fiange-7', commonlyknown asa deckflange, is riveted or otherwise attached to the cylinderj', or it may be formed integral, as shown in Fig. (5. In the latterconstruction a hub or offset 7c is formed upon the upper end of the pipel), into which a flange lz' upon the upper section of the jacket isinserted. This construction permits a secondary joint of pipe to beplaced Within the upper end of the pipe I), and a supplemental jacket tobe employed therewith, it desired, as indicated in dotted lines.

Should the cylinder be eXtcndedthrongh the roof and left open at thebottom, a lamp or gas-jet may be placed beneath the open end, as shownat m in Fig. 4, by which a constant circulation of heated air may vemaintained around the upper end of the pipe.

In Fig. 2 I have shown a double shell surrounding a portion of the pipewhere it passes through the roof. This serves to center the pipe andhold it firmly in position Without undue strain upon the flanges. Asimilar resuit may be accomplished by 'means of three or more springs n,Fig. 3, extending inwardly from the outer shellf.

While I prefer to employ the double flanges e c', it is obvious that butone may be employed, as shown in Fig. 6. rIhe length of the jacket maybelong or short, as maybe preferred.

Having thus described my invention, I claim- The combination, with aVentilating-pipe, of a surrounding air inclosing sectional jacketconsisting of two concentric cylindrical flanges extending in onedirection and a cylinder extending in an opposite direction to fitloosely but closely between said concentric flanges, whereby a tight butyielding telescoping jacket may be formed around the npper end of thcpipe, substantially as shown and set forth.

In testimony whereof I have signed this specification,in thepresence oftwo subscribing witnesses, this 16th day of January, 189i.

THOMAS C. BOYD.

Witnesses:

D. H. FLETCHER, T. E. DIXON.

